Only a few decades ago, Baja California was mostly unknown to the outside world, sparsely populated, and difficult to visit. And most of it is very dry desert. But crowds and developers have discovered the southern part of the peninsula and have arrived in droves, threatening the very features that make the Peninsula such an unusual place. Meanwhile, overharvesting in the Gulf of California has caused fish stocks to plummet and threatened the entire ecosystem. Now, Mexicans and international experts are fighting back.